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Plant Nematodes in South Africa. 7. a Check List of Plant Nematodes from the Fynbos Biome, with a Description of Helicotylenchus Curatus Sp

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Plant Nematodes in South Africa. 7. a Check List of Plant Nematodes from the Fynbos Biome, with a Description of Helicotylenchus Curatus Sp marais.qxd 2004/04/15 07:56 Page 67 Plant nematodes in South Africa. 7. A check list of plant nematodes from the Fynbos Biome, with a description of Helicotylenchus curatus sp. n. M. MARAIS, E. VAN DEN BERG, A. SWART and L.R. TIEDT Marais, M., E. van den Berg, A. Swart and L.R. Tiedt. 2004. Plant nematodes in South Africa. 7. A check list of plant nematodes from the Fynbos Biome, with a description of Helicotylenchus curatus sp. n. Koedoe 47(1): 67–78. Pretoria. ISSN 0075-6458. Plant nematodes recorded during surveys in the Fynbos Biome are listed and a new Helicotylenchus species is described. Helicotylenchus curatus sp. n. is characterised by stylet length (42-46 µm in females, 37-40 µm in males), presence of two rudimentary subdorsal and two rudimentary subventral lobes on the labial disc, first lip annulus divided into six sectors, presence of fasciculi and presence of males. Nine families rep- resented by 32 genera and 152 species were identified from the Fynbos Biome. The gen- era Criconema, Helicotylenchus, Hemicycliophora, Rotylenchus, Scutellonema and Xiphinema were found in more than 30 % of the localities, whereas Caloosia, Criconemoides, Ditylenchus, Geocenamus, Hemicriconemoides, Heterodera, Hoplo- laimus, Longidorus, Meloidogyne, Mesocriconema, Ogma, Paralongidorus, Paratri- chodorus, Paratylenchus, Pratylenchoides, Pratylenchus, Rotylenchulus, Trichodorus and Tylenchorhynchus were found at fewer localities. The genera Anguina, Hirschmaniella, Histotylenchus and Zygotylenchus were each identified from a single locality. Key words: biodiversity, Fynbos, Helicotylenchus, plant nematodes, new species, South Africa, taxonomy. M. Marais, E. van den Berg, A. Swart, Nematology Unit, Biosystematics Division, ARC- Plant Protection Research Institute, Private Bag X134, Queenswood, 0121 Republic of South Africa; L.R. Tiedt, Laboratory for Electron Microscopy, North West University, Potchefstroom Campus, Potchefstroom, 2520 Republic of South Africa. Introduction 2000) during the past 30 years. The Fynbos Biome is one of the biomes defined by Low In 1987, the South African Plant-Parasitic & Rebelo (1996). In South Africa, vegetation Nematode Survey (SAPPNS) programme structure and climate mostly define these was initiated with the aim to make a compre- ecological zones. The Fynbos Biome is con- hensive assessment of the nematode biodi- sidered by many to be synonymous with the versity resources of South Africa. One of the Cape Floral Kingdom, but this biome refers objectives of the SAPPNS is to compile an only to the two vegetation groups, viz., Fyn- inventory of the plant-parasitic nematodes of bos and Renosterveld within the region (Low South Africa. Although nematodes constitute & Rebelo 1996). Renosterveld is charac- an abundant and highly diverse group of terised by the dominance of members of the invertebrates, very little is known about their Asteraceae, specifically one species diversity in fynbos. The checklist reflects on Elytropappus rhinocerotis (renosterbos), collecting done by the Agricultural Research from which the vegetation type gets its name. Council, Western Cape Nature Conservation Although renosterbos is the characteristic Board, Rand Afrikaans University and Uni- dominant plant, other plants are also promi- versity of Stellenbosch (Heyns 1971; Kleyn- nent. These plants are all shrubs, charac- hans et al. 1996; Marais & Swart 1999; Van terised by small, tough grey leaves (Rebelo den Berg et al. 2003; Van den Berg & Tiedt 1996a). The various Fynbos vegetation types ISSN 0075-6458 67 Koedoe 47/1 (2004) marais.qxd 2004/04/15 07:56 Page 68 comprise most of the area of the Fynbos Results and discussion Biome. Fynbos is characterised by the pres- The classification of nematodes followed is ence of three elements, viz., a component based on Maggenti et al. (1988) for belonging to the Cape Reed family Tylenchina, Hunt (1993) for Aphelenchina (Restionaceae), an ericoid or heath compo- and Longidoridae and Decraemer (1995) for nent and a proteoid component. Fynbos is Trichodoriae. Nine families represented by also characterised by the presence of a num- 32 genera and 152 species were identified ber of endemic or near-endemic plant fami- from the Fynbos biome (Table 1). The gen- lies, viz., Bruniaceae (Blacktips), Geissolo- era Criconema, Helicotylenchus, Scutellone- maceae (Guyalone), Grubbiaceae (Sillyber- ma, Rotylenchus and Xiphinema were the ry), Penaeaceae (Brickleaf), Retziaceae most common and were found at 40 %, (Buttbush), Roridulaceae (Dewstick) and 35 %, 31 %, 30 % and 30 % of the localities, Stilbaceae (Candlestick) (Rebelo 1996b). respectively. The predominance of records in Helicotylenchus is a cosmopolitan genus the Mountain Fynbos vegetation type is a consequence of the number of samples col- with more than 200 species described lected in this vegetation type (Table 1). (Marais 2001). This genus is found in all the Mountain Fynbos is also the vegetation type biomes of South Africa. Thirty-one species with the highest total area (27 461 km2) of of Helicotylenchus have been reported from the ten Fynbos vegetation types (Low & South Africa. This paper is the result of an Rebelo 1996). ongoing investigation on the genus Helicoty- lenchus (Marais 1993, 1998, 2001; Marais & Buckley 1992; Marais & Quénéhervé 1996; Taxonomy Marais & Quénéhervé 1999; Marais et al. 2000; Van den Berg & Marais 1995; Van den Helicotylenchus curatus sp. n. Berg et al. 2003). Figs. 1 & 2 Measurements Material and methods Holotype female: L = 933 µm; a = 26.4; c = Soil samples were collected with a garden trowel, 43.8; c' = 1.2; stylet length = 42 µm; m = soil auger or spade to a depth of about 20-25 cm at 53 %; V = 62 %. each locality. Samples were collected in unprotected areas such as farms and plantations but also in nature Paratype females (n = 9): L = 1040 ± 110.1 reserves, wilderness areas and national parks. Nema- (839-1262) µm; a = 23.0 ± 2.9 (17.5–27.5); todes were extracted from 250 cm3 of soil, killed in c = 44.1 ± 4.5 (38.1–52.0); c' = 1.0 ± 0.2 water, preserved in FAA, TAF or FPG and mounted (0.8–1.2); stylet length = 44 ± 1.7 (42–46); in anhydrous glycerine (Hooper & Evans 1993; m = 54 ± 1.4 (52–56) %; V = 61 ± 1.8 Jenkins 1964; Kleynhans 1997; Koen & Furstenberg (58–64) %. 1970; Netscher & Seinhorst 1969; Seinhorst 1959). To obtain females of Meloidogyne for identification, Paratype males (n = 5): L = 864 ± 69.6 subsamples of each soil sample, in which root-knot (760–944) µm; a = 36.2 ± 3.4 (32.5–39.2); c nematode juveniles were found, were planted to = 30.0 ± 2.9 (27.0–34.5); c' = 1.8 ± 0.4 (1.4– tomato seedlings (cv. UC82B or Roma VF) in a 2.6); stylet length = 39 ± 1.4 (37–40) µm; greenhouse. After six weeks, females were extracted m = 57 ± 3.5 (52–60) %; spicule length = 33 from the roots and mounted in anhydrous glycerine ± 0.9 (32–34) µm; gubernaculum length = 10 (Kleynhans 1991). For scanning electron ± 0.7 (9–11) µm. microscopy, FPG-preserved specimens were used after dehydration in increasing concentrations of Female: Habitus spiral. Lip region 7 ± 0.5 acetone. Following conventional critical-point dry- (6–8) µm high and 10 ± 0.9 (10–13) µm ing and gold/palladium-coating (15 nm), specimens wide, truncate with distinct labial disc, six to were viewed with a Quanta 200 ESEM. seven annuli, basal annuli bulging out. Koedoe 47/1 (2004) 68 ISSN 0075-6458 marais.qxd 2004/04/15 07:56 Page 69 Table 1 Plant nematodes found associated with the Fynbos Biome 1a 2 3 4 5 6 7 8 % Incidenceb Number of localities samples 1 12 16 28 159 2 1 7 ANGUINIDAE Anguina agrostis (Steinbuch, 1799) Filip'ev, 1936 + <1 Ditylenchus spp. + <1 Ditylenchus africanus Wendt, Swart, Vrain & Webster, 1995 + <1 BELONOLAIMIDAE Tylenchorhynchus spp. + + + + + 15 Tylenchorhynchus avaricus (Kleynhans, 1975) Fortuner & Luc, 1987 + <1 Tylenchorhynchus capitatus Allen, 1955 + + 1 Tylenchorhynchus clarus Allen, 1955 + <1 Tylenchorhynchus dewaelei Kleynhans, 1992 + <1 Tylenchorhynchus estherae Kleynhans, 1992 + + 1 Tylenchorhynchus indicus (Siddiqi, 1960) Fortuner & Luc, 1987 + <1 Tylenchorhynchus mashoodi Siddiqi & Basir, 1959 + <1 Tylenchorhynchus namibiensis Rashid & Heyns, 1990 + <1 Tylenchorhynchus phaseoli Sethi & Swarup, 1968 + <1 Histotylenchus spp. + <1 Geocenamus brevidens (Allen, 1955) Brzeski, 1991 + + 1 PRATYLENCHIDAE Hirschmaniella spp. + <1 Pratylenchoides spp. + + <1 Pratylenchus spp. + + + + + 11 Pratylenchus crenatus Loof, 1960 + <1 Pratylenchus delattrei Luc, 1958 + <1 Pratylenchus neglectus (Rensch, 1924) Filip'ev & Schuurmans Stekhoven, 1941 + + 1 Pratylenchus penetrans (Cobb, 1917) Filip'ev & Schuurmans Stekhoven, 1941 + + 3 Pratylenchus pratensis (de Man, 1880) Filip'ev, 1936 + <1 Pratylenchus vulnus Allen & Jensen, 1951 + <1 Pratylenchus zeae Graham, 1951 + 1 Zygotylenchus guevarai (Tobar Jiménez, 1963) Braun & Loof, 1966 + <1 HOPLOLAIMIDAE Hoplolaimus spp. + 3 Hoplolaimus capensis Van den Berg & Heyns, 1970 + + + 4 Hoplolaimus pararobustus (Schuurmans Stekhoven & Teunissen, 1938) Sher, 1963 + 1 Rotylenchus spp. + + 5 Rotylenchus alius Van den Berg, 1986c +++ 6 Rotylenchus brevicaudatus Colbran, 1962 + + + 8 Rotylenchus catharinae Van den Berg & Heyns, 1974 + + 1 Rotylenchus caudaphasmidius Sher, 1965 + 2 Rotylenchus incultus Sher, 1965 + + 3 Rotylenchus karooensis Van den Berg, 1986 + 1 Rotylenchus kenti Van den Berg, 1989 + + + 2 Scutellonema minutus (Sher, 1964) Germani, Baldwin & Wu, 1986 + <1 ISSN 0075-6458 69 Koedoe 47/1 (2004) marais.qxd 2004/04/15 07:56 Page 70 Table 1 (continued) 1a 2 3 4 5 6 7 8 % Incidenceb Number
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